11 31 505 Adjusting timing of camshaft(s) (N20, N26)

Special tools required :

Necessary preliminary work :

Remove CYLINDER HEAD COVER .
Check TIMING .

With 1st cylinder in TDC firing position, cams of intake camshaft point upwards at an angle.

Position tracing gauge (2) on mounting flats of intake camshaft.

Order number: 2 212 831

Fig 1: Positioning Tracing Gauge On Mounting Flats Of Intake Camshaft

G09923107

Courtesy of BMW OF NORTH AMERICA, INC.

With 1st cylinder in TDC firing position, cams of exhaust camshaft point upwards at an angle.

Fig 2: Identifying Exhaust Camshaft Position With Cylinder 1 At TDC

G09923108

Courtesy of BMW OF NORTH AMERICA, INC.

The designation E and A on the intake and exhaust camshaft (1) as well as the part numbers can be read from above.

Fig 3: Identifying Intake And Exhaust Camshaft Designation

G09845251

Courtesy of BMW OF NORTH AMERICA, INC.

Secure mounting bridge (1) on cylinder head.

Secure tracing gauges (2 and 3) to mounting bridge (1).

Fig 4: Identifying Mounting Bridge And Tracing Gauges

G09923110

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: The screw connection (5) is imperative for undoing and securing the central bolt.

Secure tracing gauge (2) with screw (5).

Fig 5: Securing Tracing Gauge With Screw

G09923111

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: The screw connection (7) is imperative for undoing and securing the central bolt.

Screw (6) must be removed for securing the screw (7).

Secure tracing gauge with screw (7).

Fig 6: Identifying Screws

G09923112

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Only use special tool to undo central bolts (2 and 3) of VANOS units.
If it is not possible to fit special tool, mounting flats of relevant camshaft must be counter-held (risk of damage!) .

Undo central bolts (2 and 3).

Fig 7: Identifying Central Bolts

G09923113

Courtesy of BMW OF NORTH AMERICA, INC.

Remove vacuum unit (1) and lay to one side.

Release CHAIN TENSIONER (2).

Tightening torque 11 31 7AZ .

IMPORTANT: Have a cleaning cloth ready. A small quantity of engine oil will emerge after the screw connection has been released.
Make sure no engine oil runs onto belt drive.

Fig 8: Identifying Chain Tensioner And Vacuum Unit

G09923114

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note :

Replace sealing ring.

Rotate camshaft sensor wheel until retaining pin (1 and 2) match up with setting gauge.

Secure camshaft sensor wheel.

Fig 9: Aligning Retaining Pin With Setting Gauge

G09923115

Courtesy of BMW OF NORTH AMERICA, INC.

Pretension timing chain with special tool 00 9 4600, 6 Nm

Fig 10: Pretensioning Timing Chain Using Special Tools

G09845257

Courtesy of BMW OF NORTH AMERICA, INC.

Only use special tool to secure central bolt (1) of intake adjuster.

Tightening torque 11 36 1AZ .

Fig 11: Securing Central Bolt Of Intake Camshaft Adjuster

G09923117

Courtesy of BMW OF NORTH AMERICA, INC.

Only use special tool to secure central bolt (1) of exhaust camshaft adjuster.

Tightening torque 11 36 1AZ .

Fig 12: Securing Central Bolt Of Exhaust Camshaft Adjuster

G09923118

Courtesy of BMW OF NORTH AMERICA, INC.

Remove all special tools.

Crank engine on the central bolt twice in the direction of engine rotation and check the TIMING .

Assemble engine.